Mining machine



M. P. HQLMES.

MINING MACHINE Dec. 23, 1930.

Original Filed Feb. 2, 1925 6 Sheets-Sheet 2 M. P. HOLMES MINING MACHINE Dec. 23, 1930.

Original Filed Feb. 2, 1925' 6 Sheets-Sheet 3 M. P. HOLMES Dec. 23, 1930.

MINING MACHINE 6 Sheets-Sheet 4 Original Filed Feb. 2, 1925 g g 3% g m 3w g Q Q Q R Q M. P. HOLMES MINING MACHINE Dec. 23, 1930.

6 Sheets-Sheet 5 Original Filed Feb. 2, 1925 QQN QN a w 5 5 xa 5 Dec, 23, 1930. M. P. HOLMES 1,

MINING umcnms .Qx 'iginal Filed Feb. 2, GSheats-Sheet e ZZZ l F I 246 27.5 5 20/5 Z42 259 M 242 24 m 1 m1 w Win: Z49 22 0 91 A 2M 2 3 250 m 41 Patented Dec. 23, 1930 :iinir srArEs PATENT QFFICE MORRIS r. HOLMES, on onnnnmoivr, NEW HAMPSHIRE, Assienon r0 SULLIVAN MA- GHINERYCOMPANY, A CORPORATION or MASSACHUSETTS MINING MACHINE My invention relates to mining machines and more particularly to coal mining machines of the wheel mounted type adapted to operate from the mine traekway.

I An object of my invention is to provide an improved mining machine. Another object of my invention is to provide an improved mining machine of the wheeled'truck mounted type adapted to operate from the mine trackway. Still another object of my invention is to provide an improved mining machine of theSo-called universal type of a low, compact character especially adapted to use in mines having narrow or low veins wherein improved and simplified operating mechanism for the cutting'mechanism, improved propulsion mechanism, and improved raising and lowering means for the cutting mechanism are provided. A further object of my invention is to provide an improved mining machine of the combined horizontal and vertical cutter type wherein the cutter bar may be expeditiously adjusted in aplurality of operative positions. A still further object of my invention is to provide an improved mining machine of the wheel mounted type having improved elevating mechanismfor the machine body wherein the truck wheels may be driven irrespective of the elevation or angle in altitude of the body relative thereto. A still further object of my invention is to provide an improved tilting means for the cutter bar. Another ob ject of my invention is to provide an improved, simplified, and exceedingly compact general arrangement of parts whereby the machine may be operated with facility and expeditiously in mines having narrow or low veins. These and other objects and advantages of my invention will, however, hereinatterinore fully appear.

In the accompanying drawings I have shown for purposes of illustration one form and two modifications thereof which my invention may assume in' practice.

In these drawings,'

Fig. 1 is plan View of a mining machine constructed in accordancewith one illustrative form of my invention, the view being partially broken away to facilitate illustra- Applicacion filed Feb'ruaryfi, 1925, Serial No. 6,477. Renewed April 24, 1930.

tion and the cutter bar being shown in horizontal cutting position.

Fig. 2 is a side elevational view of the machine shown in Fig. l, the cutter bar and machine, body being shown in its elevated position. 7 V Fig. 3 is an enlarged, vertical, longitudinally extending, sectional View through the improved cutting mechanism, the view being taken substantially on line 33 of Figs. 1 and 5.

Fig. 4 is a vertical, transverse sectional view taken substantially on line 4-4 of Fig. 3.

Fig. 5 is an enlarged plan view of the forward portion of the machine shown in Fig. 1, the view being partially broken away in section to illustrate certain details of the construction.

Fig. 6 is an enlarged plan view of the central feeding portion of the machine shown in F ig'. 1, the view being partially broken away in section to illustrate certain details.

Fig. 7 is a transverse, vertical detail sec- .tional viewtaken substantially on line 77 of Fig. 6.

Fig. 8 is a vertical, longitudinally extending, sectional view taken substantially on line 8'8 of Fig. 6. V

Fig. 9 is an enlarged, vertical, longitudinally extending, sectional view through a port-ion of the improved propulsion means, the view being taken substantially on line 99. of Figs. 1 and 6.

Fig. 10 is a transverse, vertical sectional view taken substantially on line 10-l0 01"- F ig..9. I

Fig. 11 is a diagrammatic sectional view illustrating the improved elevating and bar tilting mechanism, the mechanism being shown in a plurality of positions.

Fig. 12 is an enlarged, transverse, vertical sectional View taken substantially on line 12-12of Fig. 2. i

Fig. 13 is a transverse, vertical sectional view illustrating the improvecl.1neans for. bodily rotating the machine frame, the view being taken substantially on line 13-43 of Fig. 2.

the friction device for retarding rotation of the bar swinging gears, the view being taken substantially on line 1 1-14 of Fig. 5.

Fig. 15 is a detail view of a portion of the improved cutter chain clutch controlling mechanism.

Fig. 16 is a detail sectional view illustrating the improved tension controlling means for the cable reel driving member.

rig. 17 is a detail view of a modified form of the machine frame rotating mechanism.

Fig. 18 is a modified form of the operating mechanism for the elevating mechanisn'i.

In this illustrative form of my invention 1 have shown a mining machine 1 of the socalled universal typewhich, as an entirety comprises cutting mechanism improved truck driving mechanism 3, and improved elevating and bar tilting mechanism 1. The cutting mechanism driving mechanism and the truck driving mechanism are disposed within an elongated machine frame 5 of gen erally rectangular shape comprised of three sections, i. e. a cutting mecl'ianism carrying section (3, a motor section 7, and a section 8 housing the propulsion mechanism and cutting mechanism adjusting mechanism, the motor section 7 being interposed between the sections 6 and 8 to which it is rigidly secured by means of spacing or hearing members 9 and 10. The bearing members 9 and 10 are provided with cylindrical longitudinally spaced bearing surfaces 11 (Fig. 12) disposed coaxially with the major axis of the machine frame and these bearing members are journaled within suitable upper and lower semicircular bearing sleeves 12 and 13, the latter of which are carried by depending brackets or supporting frame members 1 1 and 15 secured, as by bolts 16, to parallel longitudinally extending frame or angle members 17 and 18 which hold the brackets 14 and 15 in rigid relation and form supports for certain other portions of the machine as hereinafter described. The upper bearing sleeves are carried within clamping members 19 pivoted. as at 20, on the bracket members 11 and 15 and which are adapted to be held in clamping position by suitable adjustable screws 21. These clamping meml ers are adapted to maintain the machine body in any adjusted position relative to the frame members 14 and 15. Dowel pins are provided for preventing displacement of the sleeves. As illustrated, the frame members 14 and 15 are provided with horizontally disposed, transverse, laterally spaced bores 23 formed within suitable clamping members and within which bores sleeve members 24 are inserted formin bearings for parallel supporting arms 25 and-26 in turn carrying any suitable roller bearings 27 and axles 28 and 29 ournaled therein. The outer ends of these axles have secured thereto by suitable nut and washer connections 30, truck wheels held in suitable spaced relation by means of spacing sleeve 32, the arms 25 and 26 and wheels 31 constituting the supporting means for the machine.

In specifically describing my in'iproved cutting mechanism, generally designated 2, it will herein be noted that housed within the motor section 7 is a suitable driving motor herein of the usual reversible electric type, having a longitudinally extending horizontal armature shaft 36 journaled within suitable ball bearings 37 (Fig. 3) ca 'ried by a motor head member 38 suitably secured within a bore 39 formed within the bearing section 3). The shaft 36 has secured thereto at its forward end a coaxially disposed hollt v shaft i0 journalcd in suitable bearings 41 carried withii'i a head member e2, similar to the head member 38 and longitudinally spaced therefrom, carried within a bore 43 formed in the forward end of the frame member 9. A suitable screw 14: extends coaxially through the hollow shaft and engages a threaded reduced portion 45 formed on the armature shaft 36, thus holding the shafts 10 and 36 in rigid operative relation. The shaft 410 has formed thereon at its forward end, in front of the bearing 11, a suitable spur pinion 46. As illustrated, the pinion is internally bored, as at 4:7, to receive a suitable ball bearing 18 within which, and a bearing e9 carried by the frame section 6, a shaft is journaled and disposed coaxially with shafts 4.0 and 236. The shaft 50 has formed thereon a spur gear 51 disposed coaxially with the pinion 16 and this gear 51 is adapted to be selectively connected, by means of an internal coaxial shipper gear 52 formed on a flanged shipper member 53, in driving relation with the pinion 4-6. The shipper member 53 is adapted to be actuated longitudinally by means of a shipper yoke in the form of a bell crank pivoted, as at 4-. and 5) on a vertical axis within the machine frame and this bell (innit is provided with radial arms 56 and 51' adapted to cooperate with the shipper memher 53 and a bifurcated member 58, respectively. The bifurcated member 58 is ada 'ited to engage a vertical pin upon the arm 57 and is suitably carried by a cylindrical member (30 slidably mounted within a sleeve (31 in turn mounted within a transversely disposed bore 62 formed in the side of the frame section 6. Moreover, the sleeve 61 has secured thereto, as by radially extending studs 63, an operating member or grasping portion (34- and one of the studs is provided with an inwardly projecting pin adapted to cooperate with a cam slot 85 formed within the member 60. Furtheru'iore, the member is provided with an upstanding portion 66 having secured, as at 67 at its upper end, a transversely disposed rod (58 which is, in turn, secured at its opposite end within a cylindrical member 69 similar to the member 60 and likewise provided n at with an operating portion 7 0 disposed at the opposite side of the machine frame from the portion thus enabling the operator to actuate the clutch from either side of the machine.

As illustrated, the shaft 50 has formed thereon a bevel pinion 71 which meshes with a bevel gear 72 rotatable on an axis perpendicular to the axis of the armature shaft and the gear 72 is journaled in suitable spaced bearing-s 73 carried within the machine frame. The bevel gear 72 has formed thereon a spur pinion 74 which meshes'with a large spur gear 75. The gear 75 is provided with a lateral, annular, depending sleeve 76 journaled on spaced bearings 77 surrounding and disposed coaxially with a cutter chain driving shaft 78 disposed 011 an axis parallel with the axis of the gear 74 and journaled at its opposite ends within suitable ball bearings 79 and 80, the former of which are carried within a portion of the frame section 6 while the latter are disposed within a bore 81 formed within a circular bearing portion 82 formed integral with the cutter bar 83. The shaft 78 has secured thereto at one end, as by a suitable key and a radially expanding split washer connection 84, a cutter chain driving sprocket 85, of a well known form, which is adapted to be driven through suitable clutch connections, hereinafter described, by the motor driven gear 7 5. A cutter bit carrying cutter chain 86 is adapted to be circulated about the outer edges of the cutter bar 83 and is driven by the sprocket 85 in the usual manner. 'As illustrated, a resiliently positioned annular packing ring 87 is disposed between the cylindrical portion 82 and the sprocket 85 and this member 87 prevents the entry of any foreign substance and thus prevents damage to and excessive wear of the moving parts of the machine. The circular b'earing portion 82 of the cutter bar is disposed within suitable spaced cylindrical bearing sleeves 88 supported by an annular portion 89 of the machine frame and has secured thereto, by a radially expanding split washer connection 90 an annular bearing member 91 which receives the thrust of the cutter bar. The clutch for connecting the gear 75 and the sprocket 85 in driving relation comprises a gear 92 secured to the shaft 78, intermediate its ends, as by a key 92 and a gear 93 held in operative relation with the gear 75 by means of a semi-permanent clutch 93, which gear is journaled upon a bearing sleeve 94 surrounding the shaft 78 and these gears 92 and 93 are adapted to be connected in driving'relation by means of a sliding internal gear 95 formed on a flanged shipper member 96. As illustrated, the shipper member 96 is adapted to be reciprocated longitudinally of the shaft 78 by means of a shipper yoke 96 carried on a shaft 97 journaled within laterally spaced bearing members 98 suitably secured to a portion of the machine frame 6. One end of the shaft 97 has secured thereto an arm or lever 99 provided with a slotted end portion 100 which cooperates with an eccentrio 101 secured to a shaft 102 journaled within the frame sections and which has secured thereto an operating lever 103 which is adapted to be held in its different positions by means of a manually operable spring pressed plunger 104. It will thus be evident that by suitably manipulating the lever 103 the gear 93 and consequently the gear 75 driven by said motor 35 and the sprocket 85 may be connected in driving relation at the will of the operator, thus permitting the cutter chain to be rotated or remain idle.

In my improved cutter bar swinging mechanism it will herein be observed that the cutter bar 83 is adapted to be swung or slued through suitable mechanism hereinafter described of the same general type as that disclosed in my copending application, Serial No. 694,139, filed Feb. 20, 1924, at a slow or cutting speed in one direction or at a fast or positioning speed in the opposite direction. In specifically describing the slow or cutting speed driving mechanism it will be noted that the gear 75 is meshed with a spur pinion 105 which has secured thereto a worm 106 having teeth of slight lead and which meshes with a worm gear 107. The worm gear 107 has keyed thereto, as at 108, an annular member 109 journaled on ball bearings 110 carried by the frame section 6. A friction clutch, generally designated 111, is disposed within the worm gear 107 and this clutch comprises friction disks of usual form certain of which are carried by the member 109 while others are car ried by a spider member 112 suitably keyed to one end of a transversely disposed shaft 113 journaled within suitable sets of spaced bearings 114 carried by the machine frame. A plate member 115 is provided for applying pressure to the friction disks and this member is provided with a central bore 116 within which a coiled spring 117 is disposed adapted to react on a washer 118 engaging the member 115 and the hub of a hand wheel or operating member 119, respectively. The hand wheel 119 is suitably secured to a transversely dis posed, coaxial, threaded operating shaft 120 disposed transversely through and threaded within-the shaft 113. It will thus be evident that'the load of the hand wheel 119 is transmitted through and is limited by the coiled spring 117, thereby preventing excessive strain being applied to the driving mechanism and the motor, for instance, when extremely hard material is encountered by'the cutter chain. As illustrat ed, a worm 121' is keyed, as at 122, to the shaft 113 and this'worm is meshed with aworm gear 123 bolted at 124 to an annular hub 125 keyed at 126 to a shaft 12'? disposed parallel with and in front of the shaft 78.

pressure applied by the a is,

The shaft 127 journaled in suitable spaced bearings 128 at its ends and held in position by a suitable radially expanding split washer 129 similar to the washer S 1 heretofore described. The shaft 127 has "formed thereon a spur pinion 130 which meshes with a large spur gear 131 liiol ed, as at 132, to a housing or cutter chain guard portion 133 termed on the cutter bar Furthermore, it will be observed that the gear 131 is internally grooved, as at 1352, within which groove a guide plate 135 projects, this plate being suitably secured as by bolts 136, to the frame section 6. From the foregoing description it will he CV11 that when the ti" :tion clutch 111 is lflpplietl power will be transmitted from the motor ginthrough pinion 71, gear 7 ion 74;, gear 75, spur pinion 105, worm 106, vorin gear 107, spider 112, shaft- 113, worm 121. worm gear 123, spur pinion 130 meshing with internal gear 131 thereby swinging the cutter bar in a counter-clockwise direction as viewed in Fig. 5 at a. slow or cutting speed. M will also be evident that by varying the pressure applied to the clutch disks any suitable variants oi such speed may be obtained. Referring particularly to the i'ast speed ha swinging mechanism it will herein be note. that a pinion 137 meshes with the spur g 75, and this pinion is oppositely spaced relative to the gear and with respect to the axis of the gear 75. The pinion 137 has sooured thereto and rotatable therewith a worm 138 having threads of steeper lead than the threads of the worm 106, and this worm meshes with a worm gear 139 driven through a friction clutch, not shown, similar to the clutch 111 and operated by a suitable hand wheel or operating member Lit) and this worm gear 139 is adapted to drive, through the friction clutch, the worm 121 keyed to the shalt 113. Form the foregoing description it will be evident that when the clutch connect ing the worm 159 in driving relation with the worm 121 is applied and the clutch 111 is released. power will be transmitted from the motor 35 through the pinion 71, gear 72, pinion 7%. gear 75, pinion 137, worm I is,

138, worm gear 139. worm 121, worm gear 122-3, and pinion meshing with the internal gea r 131, thus swinging the bar in an oppos direction at a fast or positioning speed.

will also be evident that by slipping the clutch controlling the fast teed driving mechanism any suitable variants of such speed may be obtained. interposed between the bearings 114 of each set of bearings 11" for the gears 107 and 139 is a friction device, generally designated 141, which comprises a plurality t semi-circular plate members 142 keyed to the shaft 113, as at 1&3, and reacting between these members 142 are suitable coiled springs 14% which force the members 142 outwardly against a bore 145 formed within the frame section 6 friction-ally engaging the latter, thus retarding rotation of the shaft 113 and worm 121 when the friction clutches controlling the gears 107, 13$) are inoperative, thereby preventing unintentional rotation of the gear 121 at that time.

In my improved feeding or propulsion mechanism it will herein be noted that the rear end of the armature shaft 36 is journaled in suitable ball bearings 1&7 carried within a suitable head member 118 and this sha'i't has secured thereto as by a bolt connection 14:9 a clutch element provided with internal clutch teeth adapted to engage teeth 151. formed on a longitudinally extending shait 152 disposed coaa-iially with the armature shaft and which is in turn journaled at its rear end. in a bearing 153 suitably carried by the spacing or bearing member 10. The rear end 01 the shaft 152 has suitably secured thereto a pinion 15 1- which is adapted to drive the truck whe ls 3. through improved tranmnis sion mechanism to be hereinafter described including transmission gearing and controlling clutches substantially similar to that described, in my copending application ller. lio. 757,031 iiled Dec. 19, 192%, at a slow speed in one direction or at a fast speed in a reverse direction without reversing the motor. In spocilically considering the fast feed mechanism it will be noted that the pinion 154; (Fig. 9) meshes with a spur gear 155 suitably journaled within suitable bearings 156 carried by the frame section 8 and the gear 155 l as cured thereto and rotatable therewith a spur pinion 157 which in turn meshes with a larger internal gear 158. he hub 159 of the gear 158 is herein also journaled on a suitable hearing sleeve 160 on a sleeve clutch member 161 keyed, as at 162, to a longitudinally disposed horizontal main teed driving or transmission shaft 162) journaled at its opposite ends in suitable bearings 16d and. 165 carried within the frame section. Moreover, it will be noted that the member 161 carries a series of Eriction disks 166 which disks cooperate with a corresponding series of disks 167 carried by the sleeve of the internal gear. As shown, thc sleeve. on the internal gear is also provided with a plurality of radially located longitudinally extending slots 168 receiving radial lingers 169 on an interlocking member 170 keyed to the hub of a pinion 171 freely rotatable on the shaft 163. Between these fingers 169 are friction clutch operating lingers 172 carried by a cylindrical plane nicmben173 disposed coaxially with the hub of the gear 158. These fingers 172 extend longitudinally in contact with one set of the friction disks 166, 167. As shown, the rear end of the shaft 163 has secured thereto as by a key 17%, a spur pinion 17 5 which meshes with a spur gear 176 journaled within suitable bearings 17 7 carried by the frame section 8. The spur gear 176 has secured thereto and rotatable therewith a spur pinion 178 which meshes with a larger internal gear 179 keyed, as at 180, to a longitudinally extending horizontal twopart transmission shaft 181 disposed coaXial- 1y with the transmission shaft 163 and in turn suitably journaled at its forward end within a roller bearing 182 carried within a head member 183 and journaled at its rear end within longitudinally spaced ball bearings 184 disposed within a bracket 185 secured as by screws 186 to a gear housing member 187 suitably secured at its opposite ends to the angle frame members 17,, and 18. The rear end of the shaft 181 has secured thereto as by a suitable key 188 a bevel gear 189. It will thus be noted that the rotation of the arma ture shaft 36 may be transmitted to the pinion 154, gear 155,, pinion 157,internal gear 158, friction clutch disks 166, 167, clutch member 161, shaft 163, pinion 175, gear 176, pinion 178, internal gear 179, and the shaft 181 to the bevel gear 189 to rotate the latter at a predetermined high or fast speed whenever the clutch controlling member 173 is operated to connect the clutch. It will here further be evident that the speed of such feed may be lowered at will by slipping the friction disks 166, 167. Referring specifically to the slow or cutting feed it will be noted that when the clutch controlling member 173 is in inoperative position and the clutch is released power will still be transmitted through the interlocking member 170 to the pinion 171 which is freely rotatable on the shaft 163. This pinion in turn meshes with a gear 190 disposed coaxially with the gear 176 and this gear has secured thereto and rotatable therewith a pinion 191 which meshes with a spur gear 192 disposed coaxially with and rotatable on the shaft 163. This gear 192 has secured thereto a spur pinion 193 which meshes with a spur gear 194 disposed coaxially with the car 190 and this gear drives a spur pinion 195 which meshes with an internal gear 196 substantially similar to the internal gear 158. The internal gear 196 also houses a friction clutch substantially similar to the clutch heretofore described in connection with the clutch disks 166, 167 and this clutch includes clutch disks 197 198 certain of which are carried on a clutch member 199 keyed, as at 200, to the shaft 163, while others are carried by a sleeve formed on the internal gear 196 and a clutch retaining member 201 is provided keyed, as at 202, to the hub of the spur pinion 175 and a this clutch member in this instance has no interlocking function and is only a disk retaining member. A plane clutch operating member 203 surrounds the hub of the clutch member 201 and is provided with longitudinally extending fingers 204 which are adapted to engage one set of the friction disks 197, 198. As a result of this mechanism above described, although the clutch 166, 167 is disconnected, rotation will constantly be imparted through the pinion 171, gear 190, pinion 191,

gear 192, pinion 193, gear 194, pinion 195, in ternal gear 196, clutch disks 197 198, clutch member 199, pinion 175, gear 176, pinion 178, internal gear 179, and to the shaft 181 so that when the clutch 197 198 is connected the bevel gear 189 will be rotated at a slow or cutting speed in an opposite or reverse direction from the fast speed previously described. Here it will also be evident that by slipping the friction disks 197, 198 this speed may also be reduced when desired.

Operatively associated with the feeding" mechanism above described are pivoted clutch shipper members 205, 206 (see Fig. 6) provided at one end with suitable rollers 207 adapted to engage the plane surfaces of the clutch operating members 173 and 203, respectively. The outer ends of these shippers are also provided with rectangular portions 208 and 209- having arcuate engaging surfaces and these rectangular portions register with slots 210 and 211 formed in slidably engageable parallel rods 213 and 213, respectively (see F 8) suitably guided within the machine frame at their opposite ends. These rods are provided at their rearward ends with semicircular portions having threads 214, 21.5 of opposite pitch and which are adapted to engage a two-part nut 216, each part having threads of opposite pitch which engage the threads on the members. 212, 213. The nut 216 has secured thereto as by a transverse pin 217 a spur pinion 218 which is meshed with a larger internal gear 219 formed in a hand wheel 220 rotatably mounted, as at 221, upon a cylindrical bearing sleeve 222 carried by the bracket 185. It will be observed that rotation of the hand wheel 220 and consequently the threaded nut 216 engaging the threads formed on the rods 212, 213 will cause the latter to simultaneously move in opposite directions, thus causing one of the friction mechanisms to be released while the other is applied, thereby preventing simultaneous application'of two speeds, i. e. the fast and slow speeds. As illustrated, the bevel gear 189 is meshed with reverse bevels 223, 224 freely rotatable upon hearing sleeves 225 carried by a transversely disposed truck driving shaft 226. The hubs of the gears 223 and 224 are disposed adjacent one another and have formed thereon gear clutch teeth 227, 228adapted to be selectively connected by an internal shipper gear 229 with a spur gear 230 suitably secured to the shaft 226. A shipper yoke 231 engages the gear clutch member 229 and is secured to a vertical shaft 23 suitably journaled on the gear housing 187. This shaft has secured thereto at its upper end an operating lever 233. It will thus be evident that by selectively throwing the shipper gear in opposite direc ticns into operative engagement with either of the gears 223 or 224 the shaft 226 will be driven'in opposite directions by the gear 189 ed in rm the bracket 187 within an ball bearings 234 disposed a liacent t *ars 223, 2 4-. resnec ively. and in suit ollcr bearings 235 disposed ad acent its :s and one enl of this shaft has secured en thereto as by a bolt and washer connect. 236 a large spr 237. The r-rprccket 237 is connected by a chain connection 238 with a modest secured to a transrersely disposed shaft 246 disposed coaxially with the and journalcd coaxial roller zulj'acvnt its enos suitably can 2;2 formed in the sin iporti arm H end of the sha t 24!) opposite from the sprocket has secured thereto. as by a bolt and washer and key connection 243, a sprocket 244 which is connected through a chain connection 245 with a sprocket 246 suitably secured to a shaft 247 disposed parallel witn the shaft 240. The sh n 240 and 2-17 are connected. in operative dr ing relation with the truck wheels 31 carried by the axles 28 and 29, respec' tively, by gears 248 keyed to the shafts, as 249, and which mesh with intermediate idler gears 250 freely rotatable upon a bearing sleeve 251 carried by studs 252 suitably carried by the arms 25 and 26, respectively. These intermediate gears 250 are meshed with spur gears 253 keyed, as at 254, to the axles 28 and 29, respectively. From the foregoing description it will be evident that the truck wheels 31 may be driven from the gear 189 at either a fast or a slow speed in opposite directions at the will of the operator. As illustrated, the truck driving shaft 226 has sec ired thereto. by a key an annular sleeve 256 which. in turn, has keyed thereto a brake member 257 having a pcripheral groove 258 with which a brake band 259 is adapted to cooperate. The brake band 259 is provided with suitable operating lever 260 disposed at the side of the machine frame (see Fig. This brake is adapted to control the rotation of the shaft 226 during certain operations of the machine and for controlling truck movement while moving rela tive to a trackway of a steep gradient in a well known manner.

Associated with the machine pro nilsion mechanism is improved mechanism for bedily rotating the machineframe 5 and consequently the cutter bar 83 about the bearing surfaces 11 formed within the spacing or bearing members 9 and 10. Slidably mounted upon the shaft 181 in non-rotatable relation therewith is a gear 261 keyed, as at 262, to the shaftand provided at its rear end with a flanged portion 263 with which a shipper yoke 264 cooperates. The yoke 264 is secured to a shaft 265 and has secured thereto at one end a suitable controlling lever 266. This sliding gear 261 is adapted to connect a larger spur gear 267 in operative driving relation with the transmission shaft 181 and this gear 267 meshes with an arcuate rack 268 formed on a bracket 269 secured, as by bolts 270 to the angle members 17 and 18. It will thus be evident that when the gear 267 is connected in driving relation with the shaft 181 by the sliding gear 261 power will be transmitted selectively through the fast or slow feeding mechanism, thus causing the gear 267 to react upon the rack 268 and bodily rotating the machine in a vertical plane as indicated by dotted lines in Fig. 13 or in any intermediate plane, thus enabling the bar to be swung from the horizontal position shown in Figs. 1 and 2 to a vertical position, enabling the machine to operate as either a vertical or a horizontal cutter.

Improved means are provided for raising and lowering the machine frame to different vertically disposed horizontal planes and such means comprises worm gear segments 271 and 272 secured, as by bolts 273 (Fig. 12) to arms 27 4 and 27 5 secured to the parallel arms 25 and 26, respectively, and these gear segments are meshed with screw threaded portions 276 and 277', respectively, having threads of opposite lead which are formed upon a longitudinally disposed slidable shaft 278 suitably mounted at its ends within members 27 9 and 280 suitably carried by the angle member 18. The rear end of this shaft 278 is provided with vertically disposed circumferentially extending rack teeth 281 which mesh with a gear 282 (see Figs. 6 and 11) journaled upon a bearing sleeve 283 carried by the transverse shaft 226. This gear 282 is provided with a sleeve portion having gear teeth 284 formed thereon which are adapted to be connected to gear teeth 285 formed upon the sleeve 256 keyed to the shaft by means of an internal shipper gear 286. The shipper gear 286 is adapted to be actuated by means of a shipper yoke 287 socured to a vertical shaft 288 which has secured thereto, at its upper end, an actuating lever 289 (see F ig. 1). It will thus be evident that when the shaft 226 is connected in driving relation with the motor and when the gear teeth 284 are connected in operative driving relation the gear 282 will be rotated thus causing the teeth thereon to react on the rack teeth 281 forcing the shaft 278 forwardly. thus causing the gear segments 271 and 272 to swing about the shafts 240 and 247 as pivots and causing the arms 25 and 26 to swing about the wheel carrying axles 28 and 29 and thus varying the elevation of the machine frame and cutter bar as desired, as indicated by dotted lines in Fig. 11.

Associated with the elevating mechanism is improved means for tilting the cutter bar, which means comprises aplurality of circumferentially longitudinally spaced apertures 290 in shaft 278 within which a suit- 1,7ee,24s 7 able lever or wrench, not shown, is adapted to be inserted, thereby enabling the operator to bodily rotate the shaft 278, thus causing the oppositely threaded screw portions 276 and 277 to swing the gear segments 271, 272 in opposite directions, tilting. the machine frame as indicated by dotted lines in *ig. 11, the clutch member 286 controlling the gear 282 being thrown out at this time. 10 A friction clamping device (Fig. 7) generally designated 291, is provided, preventing rotation of the shaft 278 after the tilting operation is completed and this clamping device comprises a split clamp 292 secured, as by screws 293, to the angle member 18 and the clamp 292 is adapted to be operated by a bolt 294 pivoted thereto, as at 295, and hav- 'ing at its opposite end a screw and nut connection 296 for applying pressure to the 20 clamp. It will also be noted that suitable sleeves 297 are provided for housing the shaft 278 thereby preventing access of any foreign substance to the worms 276 and 277 or rack 281.

' Improved means is provided for counterbalancing the machine frame during the elevatiig and bar tilting operations and this means comprises a plurality of heavy coiled springs 298, herein four, carried by suitable sleeves surrounding the shafts 240 and 247, eacn of these springs having one end 299 reacting as at 300, Fig. 3, upon a lower portion of the spacing or bearing members 9 and 10, respectively, and th other end 301 engaging, as at 302, a portion of the parallel arms and 26 carrying the wheeled axles 28 and 29, respectively. These springs relieve the load on the teeth formed on the shaft 278 and permit a smoother adjusting operation 0 b of the bar and machine frame.

As illustrated, electric current is adapted to be conducted to he electric driving motor 35 through suitable COJQHClZO! cables 303, 30 the former of which is connected to a suitable connector plug 305 of usual form M irried by the m chine and to the usual terminal pl s, suitable fuse box being nterposed adjacent the ends of the cable,

'le the latter conductor cable 304 is connected to a suitable cable reel 306 journaled, i at 307, upon a bracket member 308 suitably bo l to the angle me 17 and 18. i re d to be driven m driving sham 226 by means rooved pulley 309 suitably sceve 310 keyed to the sl ft and to a pivoted bracket 315. The br ig. 16) is in turn secured to a transversely eed horizontal shaft 316 provided at its opposite end with an operating lever 317 disposed adjacent the side of the machine. A spring pressed plunger 318 is provided which is adapted to cooperate with teeth formed on a ratchet member 319 thereby holding the lever in any adjusted position. As illus trated, a tension spring 320 is provided havin one end secured to a portion of the bracket 187 and its other end secured to a collar 321, the latter being held in rigid relation to the shaft 316 by means of a set screw 322. his spring constantly tends to hold the idler pulley 313 in its raised or inoperative position. it will thus be evident that the operator may vary the tension upon the belt 311 as desired consequently varying the speed of rotation of the reel. Suitable angularly disposed guiding rolls 323 are provides at the rear of the reel 306 for guiding the cable 304 as it wound in or paid out by the reel. It will here.-- be noted that an operating handle 32%- is provided at the rear end of the machine frame for actuating a suitable controlling mechanism (not shown) which controls the flow of electric current to the driving motor 35.

In the modified form of my invention shown in Fig. 17 it will herein be observed that the rack 268 instead of being semi-circular is made annular as indicated at 325, thus enabling the gear 267 to rotate the machine frame and cutter bar in any desired plane about an axis coaxial with the shaft 181 and thus enabling the machine to operate as a vertical cutter at opposite sides of the ver tical. center line of the machine or as an undercutter or an overcutter, although in this instance a higher machine is produced. It will further be observed that when it is desired to operate the machine as an overcutter a semi-circular rack may still be used substantially similar to that shown in Fig. 13 and the screws holding the frame section 6 in position may be removed and the head rotated at an angle of 180 degrees relative to the machine frame with the bar in' a horizontal plane above the horizontal center line of the machine frame. The head may then again be rigidly secured in position, the ma chine thus being enabled to operate as an overcutter or a shearer or vertical cutter. It will still further be observed that if desired manual means may be employed for operating the elevating rod 278 as shown in 18 and this means herein comprises a worm gear 326 journaled on the shaft 226. The worm gear 326 is adapted to be connected in operative driving relation with the gear 282 by means of a slidin dental clutch 327. A worm 328, suitably jonrnaled in the housing 187. meshes with the worm gear 326 and is adapted to be manually rotated by means of a suitable ratchet and pawl mechanism of usual form including a-lever 329. It will thus be evident that when the clutch 286 is e man why ac J 2 the shaft 28? i t arms 3. and 26 and cvation of the machlne us; the cl ("he neral "alone of operation of the machine i now le.--icr1bed. It will be assinned 3 the machine is running about the mine tracxs in the entry at a fast or i )Q lti under the control of the fricuse, it and when the working .achcd the fast feed clutch if an undercut is desired to be made the clutch 53 is connected and the operator then mani the hand whee-l rio controlling the a. oar swinging friction and the bar swung: or slued at a fast feed to a point adjacent the right hand rib. The clutch member 96 thrown into operative driving relation and the futter chain sprocket is then actuated through transmission means from tae motor. The feed f ition is then released and the slow 'ceu clutch 19?, 198 is thrown in and the bar s impod or fed into the coal at a slow or once .xg speed, the friction elements H2 preventing rotation of the bar swinging worm 121v and locking the bar in position at this time. When the sumping cut is completed the slow truck feed clutch is then thrown out and the braxe band 259 set, thus preventing rotation of the trucl; wheels and the hand wheel. 119 then manipulated causing application of the slow speed clutch ill. and the bar is consequently sv-iung about its pivot, the slow bar swinging clutch m-reafter being released. The band u rotation of the truck wheels is l the operator throws the ch neat 229 into driving rclatio 1 nspoi i'lUl'l clut h face of the coal is tnen released.

rse gez r and the slow truch 's applied and the bar 11c coal at cutting speed, i 1 ienner. it is do ired to vei .sal cut the sliding gear ember thrown into mesh with the gear d t ie machine and cutter bar bodily swung into a vertical position about its pivot, the clamps 19 being released. at this time. 'lhe chimps 19 are then again tightened, holding the machine frame in non-rotative posii and the bar is then swung up at a fast feed to a point adjacent the mine roof and bar stumped into the coal at a cutting rd and th on swung) downwardly to the botom of the mine and LilC bar withdrawn from he coal in a manner sul stantially similar to bat heretofore described in regard to the horiaontal out. If it is desired to vary the levation of the bar and the machine frame clutch element 286 is thrown in operative hition with the gear member 285 'vine' worm is rotated, thus sliding the shaft 2'?8 and swinging the racks 21 l, 2i2 and consequently the machine frame upwardly to any elevation desired. If it is desired to ti it the bar the clutch member 286 is thrown out and a suitable bar or wrench is inserted into the apertures 2.90 in the shaft and the shaft rotated, causing the worm racks 271, 2?2 to be SWUD in opposite directions thus varying the an e of the machine frame rel. tive to the horiy ontal and consequently the angle of the cutter bar relative to the mine bottom. (Ether operations and advantages of my invention will be clearly apparent to iho:-1e-sl ;illed in the art.

While l have in this application specifically (lo-scribed one form and two modifications thereof which my invention may assun'le in practice, it will be understood that these fornr-s are used for purposes of illustration and that the invention may be modified and embodied in var. Jus other forms without departing frcun its spirit or the scope of the appended claims.

lVhat I claim new and desire to secure by Letters Patent is:

1. In a mining machine, in combination. supporting means, a motor having a casing rotatably mounted on said supporting means, cutting means carried by said motor casing, and means driven by said motor for elevating said casing relative to said support ing means.

2. In a mining machine, in combination, supporting means, a motor having a casing rotatably mounted on said supporting means about an axis coincident with the axis of motor rotation, mechanism driven by said motor for rotating said casing, cutting means carried by said motor casing, and means for bodily elevating said casing and to vary the angle of said casing relative to said supporting means, said elevating and angling means including means for tilting said motor casing about atransverse axis.

In a mining machine, in con'ibiiuitiou, supporting means, a motor having a casing rotatably mounted on said supporting means about an axis coincident with the axis of motor rotation, cutting means carried by said motor casing, and means to vary the elevation of said casing and its angle relative to said supporting means including mechanism driven by said motor.

4. In a mining machine. a wheeled supporting frame, a machine frai'nc rotatably mounted thereon for movement about a substantially horizontal axis and carrying a driving motor and variable speed transmis sion mechanism driven thereby, cutting mechanism carried by said machine frame including a plane cutter bar, said cutting mechanism being rotatable with said machine frame to enable said cutter bar to operate in either a horizontal or a vertical plane, and means driven through said transmission mechanism for propelling said wheeled supporting frame from said motor.

5. In a mining machine, a Wheeled supporting frame, a machine frame rotatably mounted thereon for movement about a substantially horizontal axis and carrying a driving motor and variable speed transmission mechanism driven thereby, cutting mechanism carried by said machine frame including a plane cutter bar, said cutting mechanism being-rotatable with said machine frame to enable said cutter bar to operate in either a horizontal or a vertical plane, and means driven through said transmission mechanism for propelling said wheeled supporting frame from'said motor irrespective of the position of said motor relative thereto.

6. In a mining machine, a wheeled supporting frame, a machine frame rotatably mounted thereon for movement about a substantially horizontal axis and carrying a driving motor and variable speed transmission mechanism driven thereby, cutting mechanism carried by said machine frame including a' plane cutter bar, said cutting mechanism being rotatable with said machine frame to enable said cutter bar to operate in either a horizontal or a vertical plane, and means driven-through said transmission mechanism for driving the support wheels from said motor irrespective of the position of said motor relative thereto. 7

7. In a mining machine, a truck, a motor thereon having a casing rotatable about an axis coincident with the axis of motor rotation, cutting mechanism driven by said motor and carried by said casing, and truck driving mechanism operatively connected to said motor including transmission means having a casing secured to and rotatable with said motor casing and housing transmission mechanism including'a plurality'of friction clutches.

8. In a mining machine, a truck, a motor thereon having a casing rotatable about an axis coincident with the axis of motor rotation, cutting mechanism driven by said motor and carried by said casing, and truck driving mechanism operatively connected to said motor including transmission means having a casing secured to and rotatable with. said motor casing and housing transmission mechanism including a plurality of friction clutches, and mechanism operatively connectible to said truck driving mechanism for effecting rotation of said motor casing. V

9. In a mining machine, a wheeled truck, a motor thereon having a casing rotatable about an axis coincident withthe axis of motor rotation, cutting mechanism driven by said motor, means for bodily elevating said motor casing relative to the truck wheels, andtruclr driving mechanism operatively connectible'to said motor.

10. In a mining machine, a Wheeled truck, motorthereon having. casing rotatable about an axis coincident with the axis of motor rotation, cutting mechanism driven by said motor, means for bodily elevating said casing relative to the truck wheels through driving mechanism operatively connectible to said motor, and mechanism operatively connectible to said truck driving mechanism for effecting rotation of said motor casing.

11. In a mining machine, a wheeled truck, a motor thereon having a casing rotatable about an axis coincident with the axis of motor rotation, cutting mechanism driven by said motor, means for bodily elevating said casing relative to the truck wheels, and truck driving mechanism operatively connectible to said motor irrespective of the position of saidmotor casing relative to the truck wheels.

12. In a mining machine, in combination, a motor, a support rectilinearly movable towards and from a working face during the cutting operation of the machine, a motor casing in which said motor is disposed rotatably mounted on said support for rotation about an axis parallel to the direction of rectilinearmovement of said support during cutting, means driven by said motor for elevating said casing, and cutting mechanism carried by said casing and rotatable therewith.

13. In a mining machine, a wheeled support, a motor casing rotatably mounted on said support for movement about a substantially horizontal axis coincident tot-he axis of motor rotation, cutting mechanism carried by said casing, driving connections between said motor and the wheels of said support for propelling the latter, and means for bodily elevating said casing relative to the support wheels.

14. In a mining machine, a wheeled support, a motor having casing rotatably mounted for movement about its longitudinal axis on said support, means on said support engaging said casing for locking the latter against rotation, cutting mechanism carried by said casing including a cutter bar, driving connections between said motor and the wheels of said support for propelling the latter, and means for changing the angle of said casing relative to the support wheels to tiltsaid cutter bar.

15. In a mining machine, a wheeled support, a motor having a casing rotatably mounted for movement about its longitudinal axis on said support, cutting mechanism carried by said casing, driving connections between said motor and the wheels of said sup port for propelling the latter, and means for angling and bodily elevating said casing relative to the wheel-s of said support.

16. In a mining machine, in combination, supporting means, a motor having a rotatable power shaft, a motor casing enclosing said motor and. mounted on said supporting means for rotation about an axis coincident with the axis of said shaft, a cutter carried by said casing, and means driven by said motor to bodily elevate said casing relative to said supporting means.

17. In a mining machine, in combination, supporting means, a motor having a rotatable power shaft, motor casing enclosing said motor and mounted on said support for rotation about an axis coincident with the axis of said shaft, a cutter carried by said casing, and means to angle and bodily elevate said cutter relative to said supporting means, said means including mechanism driven by said motor.

18. In a mining machine, in combination, supporting means, a motor having a rotatable power shaft, a machine body including a motor casing enclosing said motor and mounted on said supporting means for rotation about an axis coincident with the axis of said shaft, means c riven by said motor including transmission mechanisn housed within said rotatable machine body for effecting rotation of said casing, a cutter carried by said casing, and means to angle said casing relative to said supporting means.

19. In a mining machine, a driving motor, cut-ting mechanism driven by said motor including a pivoted cutter bar, and means for swinging said cutter bar in opposite directions at different speeds i .cluding a clutch coaxial with the axis of said motor and a plurality of selectively operable speed controlling friction clutches and means for controlling said several clutches.

20. In a mining machine, a driving motor, and cutting mechanism driven thereby including transmission gearing and a drive sprocket, and a plurality of independently operable sliding clutches, one of said clutches being adapted to connect gearing to said motor while the other clutch is adapted to connect said drive sprocket with said gearing.

21. In a mining machine, driving motor, and cutting mechanism driven thereby including transmission gear ng and a. driven sprocket, and aplurality of independently operable sliding clutches, one of said clutches; being adapted to connect said gearing to said motor while the other clutch is adapted to connect said drive sprocket with said gearing, one of said clutches being disposed coaxially' with the axis of said motor.

22. In a mining machine, a driving motor, and cutting' mechanism driven thereby including transmission gearing and a drive sprocket, and a plurality of independently operable slidin clutches, one of said clutches being adapted to connect said gearing to said motor while the other clutch is adapted to connect said drive sprocket with said gearing, one of said clutches being disposed coaxially with said sprocket.

23. In a mining machine, a driving motor,

a casing housing said motor rotatable about the axis thereof, cutting mechanism carried by said casing, and means for rotating said casing including a plurality of friction clutches and a sliding clutch.

24. In a mining machine, a driving motor, a *asing housing said motor rotatable about the axis thereof, cutting mechanism carried by said casing, and means for rotating said casing including a plurality of friction clutches disposed coaxially with the axis of rotation thereof.

25. In a mining machine, a driving motor, a casing housing said motor rotatable about the axis thereof, cutting mechanism carried by said casing and means for rotating said casing including an arcuate rack and gearing cooperating therewith, and a plurality of friction clutches controlling said gearing.

26. In a mining machine, driving motor having a housing rotatable about the axis thereof, cutting mechanism carried by said housing, and means for rotating said housing at a plurality of speeds including .a plurality of selectively operable friction clutches disposed coaxially with the axis of said motor.

2". In a mining machine, a support having truck wheels, a cutter carrying frame mounted thereon, and means for varying the elevation of said frame relative to said truck wheels including parallel arms pivoted on axes coincident with the wheel axes, and means for simultaneously moving said arms.

28. In a mining machine, a support, a cutter carrying frame mounted thereon, and means for adjusting said frame into different elevated positions including a plurality of gear segments and axially movable screws cooperating therewith.

29. In a mining machine, a support, a cutter carrying frame mounted thereon, and means for adjusting said frame into different elevated positions including parallel arms, gears segments fixed thereon, and axially movable screws cooperating with said gear segments.

30. In a mining machine, a support, a cutter carrying frame mounted thereon, means for adjusting said frame into different elevated positions including parallel arms, gear segments fixed thereon, reciprocable screws cooperative with said gear segments, and means for simul aneously reciprocating said screws.

31. In a mining machine, supporting means, a cutter carrying frame mounted thereon, and means for varying the angle in altitude of said frame relative to said supporting means including a plurality of oppositely movable front and rear supporting arms, and means including a mechanical connection between said arms for simultaneousiy moving said arms in the same direction.

32. In a mining machine, supporting means, a cutter carrying frame mounted thereon, and means for varying the angle in altitude of said frame relative to said supporting means including a plurality of oppositely movable gear segments, and a screw threaded member cooperating therewith for moving said gear segments simultaneously or independently.

33. In a mining machine, supporting means, a cutter carrying frame mounted thereon, means for varying the angle in altitude of said frame relative to said supporting means including a plurality of oppositely movable gear segments, and means for causing simultaneous movement of said gear segments in the same direction comprising a screw threaded member cooperating therewith.

34. In a mining machine, supporting means, a cutter-carrying frame mounted thereon, means for varying the angle in altitude of said frame relative to said supporting means including a plurality of gear segments cooperating therewith having teeth of opposite pitch, and means for causing simultaneous movement of said gear segments in the same direction.

35. In a mining machine, supportingmeans, a cutter carrying frame movably mounted thereon, constantly acting resilient means between said frame and said supporting means constantly tending to move said frame relative to said supporting means, and means for positively moving said frame against the action of said resilient means.

36. I11 a mining machine, supporting means, a cutter carrying frame movably mounted thereon, constantly acting resilient counterbalancing means between said frame and said supporting means constantly tending to move said frame relative to said supporting means, and means for positively moving said frame against the action of said resilient means. 7

37. In a mining machine, supporting means, a cutter carrying frame mounted thereon, and means to elevate or to change the angle in altitude of said frame relative to said supporting means including a reversely threaded screw, and means for selectively rotating or reciprocating said screw.

38. In a mining machine, a wheeledsupport, a machine frame rotatably mounted thereon carrying a. driving motor and variable speed transmission mechanism, cutting mechanism including a cutter head supported by and rotatable with said frame, said cutting mechanism being positionable to cut in horizontal or vertical planes by rotation of,

said frame, and means for driving the Wheels of said truck in opposite directions from said transmission mechanism including reverse gearing.

39. In a mining machine, a support, a ma chine frame mounted thereon and rotatable relative thereto about its longitudinal axis, cutting mechanism carried by said frame, and means including a plurality of pivoted clamps to maintain said frame in non-rotative relation relative to said support.

40. In a mining machine, a machine frame, cutting mechanism carried thereby, means for elevating said cutting mechanism including parallel arms pivoted on said frame and truck wheels carried by said arms, said arms being also pivoted on axes coincident with the wheel axes, and means for swinging said arms While their parallel relation is substantially maintained.

41. In a mining machine, a machine frame, kerf cut-ting mechanism carried thereby, and means for elevating said cutting mechanism including a plurality of parallel arms pivoted on said frame, wheeled axles carried by said arms, and transmission means between the pivotal axes of said arms and said axles.

42. In a mining machine, a machine frame, kerf cutting mechanism carried thereby, a driving motor andvariable speed transmission mechanism carried by said frame, means for elevating said cutting mechanism including a plurality of parallel arms pivoted on said frame, wheeled axles carried by said arms, and operative driving connections between said transmission mechanism and said axles.

43. In a mining machine, a machine frame, kerf cutting mechanism carried thereby, a driving motor carried by said machine frame, means for elevating said frame including a plurality of parallel arms, wheeled axles carried by said arms, and means for driving said wheeled axles from said motor irrespective of the elevation of said frame.

44:. In a mining machine, a wheeled support, a driving motor, a casing housing said motor rotatable about the axis thereof, cutting mechanism including a cutter head rotatable with said casing, and means for driving the wheels of said support from said motor including a transverse shaft and a' clutch disposed coaxially therewith.

45. In a mining machine, cutting mecha nism, a driving motor, a feeding mechanism driven by said motor for effecting feeding.

movement of said cutting mechanism including a plurality offriction clutches, and means for selectively operating said clutches including a. member rotatable about the axis of said motor. V

46. In a. mining machine, a wheeled support, a machine casing rotatably mounted thereon including a driving motor, cutting mechanism including a cutter head rotatable with said casing, andmeans for rotating said casing relative to said support including a clutch disposed coaxially with the axis thereof.

t7. In a mining machine, a wheeled support, a machine casing mounted thereon, cutting mechanism carried by said casing, a motor for driving said cutting mechanism, and means driven by said motor for bodily elevat-ing said cutting mechanism relative to the support wheels to position the same in differently elevated parallel positions including a reciprocable shaft, and means for maintaining said shaft in a stationary position relative to said support' 48. In a mining machine, a wheeled support, a machine casing mounted thereon, cutting mechanism carried by said casing, 21 motor for driving said cutting mechanism, means driven by said motor for bodily elevating said cutting mechanism relative to the support. wheels including a reciprocable shaft, and means for frictionally clamping said shaft in stationary position relative to said support.

49. In a mining machine, a body including cutting mechanism, and vertically adjustable supporting means therefor comprising spaced arms pivoted between their ends and having wheels at one side of their pivots, an axially adjustable shaft mounted on the body and movably connected to the arms at the other side of their pivots, and means for adjusting said shaft.

50. In a mining machine, a body including cutting mechanism, and vertically adjustable supporting means therefor comprismg spaced pivoted arms, wheels on said arms, arcuate racks on said arms, an axially movable shaft mounted on the body and having oppositely threaded portions in mesh with. said racks, and means for rotating said shaft and for moving it axially.

51. In a mining machine, a body including cutting mechanism, and vertically adjustable supporting means therefor comprising spaced pivoted arms, wheels on said arms, arcuate racks on said arms, an axially movable shaft mounted on said body and having portions in mesh with said racks, and means for adjusting said shaft axially.

52. In a mining machine, a body including cutting mechanism, pivoted arms on said body carrying supporting wheels, a motor in said body, a counter shaft mounted on said body and having reversible driving connection with said motor, a driving connection between said shaft and the wheels, arcuate racks on said pivoted arms, a longitudinally extending axially movable shaft mounted on said body and having portions in mesh with said racks, and means for imparting axial movement to said longitudinally extending shaft by power from said counter shaft.

53. In a mining machine, the combination of a truck supported body, a head overhanging one end of the truck and carrying a pivotally mounted cutter bar, a motor in said body, a driving connection between the motor and the truck wheels, and driving connections between said motor and the cutter bar for imparting angular movement thereto including separate clutches controlling opposite movements of the cutter bar, and means cooperating with the bar angling means for restraining said bar from movement when both said clutches are released.

54. In a mining machine, the combination of a truck supported body, a head overhanging one end of the truck and carrying a pivotally mounted cutter bar, a motor in said body, a driving connection between the motor and truck wheels, and driving connections between said motor and the cutter bar for imparting angular movement thereto including a driven shaft in geared relation to said cut ter bar, separate clutches controlling opposite driving connections to said shaft, and means cooperating with the bar angling means for preventing movement thereof under weight of the cutter bar when both said clutches are released.

55. In a mining machine, supporting means, a cutter carrying frame mounted thereon, and means for varying the angle in altitude of said frame relative to said supporting means including a pair of arcuate toothed members, and an axially movable reversely threaded screw cooperating therewith.

56. In a mining machine, supporting means, a cutter carrying frame mounted thereon, and means for varying the angle in altitude of said frame relative to said supporting means including a pair of arcuate toothed members, a reversely threaded screw cooperating therewith, and means for moving said screw axially or angularly.

57. In a mining machine, supporting means, a cutter carrying frame mounted thereon, and means for varying the angle in altitude of said frame relative to said supporting means including a aair of arcuate toothed members movable in the same direction, a reversely threaded screw cooperating therewith, and means for rotating said screw.

58. In a mining machine, supporting means, a cutter carrying frame mounted thereon, a motor carried by said frame, and means driven by said motor for varying the elevation of said frame relative to said supporting means including a pair of arcuate toothed members, and a reversely threaded screw cooperating therewith.

59. In a mining machine, supporting means, a cutter carrying frame mounted thereon, a motor carried by said frame, and means for varying the angle in. altitude of said frame relative to said supporting means including a pair of arcuate toothed members, areversely threaded screw cooperating therewith, and means driven by said motor for moving said screw axially.

60. In a mining machine, supporting means, a cutter carrying frame mounted thereon, and means for varying both the angle in altitude or elevation of said frame relative to said supporting means including a pair of arcuate toothed members, and a reversely threaded screw cooperating therewith.

61. In a mining machine, supporting means, a cutter carrying frame mounted thereon, and means for varying both the angle in altitude or elevation of said frame relative to said supporting means including a pair of arcuate toothed members, a reversely' threaded screw cooperating therewith, and meansfor moving said screw axially.

62. In a mining machine, supporting means, a cutter carrying frame mounted thereon, and means for varying the angle in altitude or elevation of aid frame relative to said supporting means including a pair of arcuate toothed members, a. reversely threaded screw cooperating therewith, and means for rotating said screw;

68. In a mining machine, a driving motor, cutting mechanism driven thereby includinga pivoted cutter bar and a cutter chain drive sprocket, bar swinging mechanism including transmission gearing driven by said motor, and a plurality of independ ently operable sliding clutches, oneof said clutches being adapted to connect said transmission gearing to said motor for drive by the latter while the other clutch is adapted to connect said cutter chain drive sprocket to said gearing for drive by said gearing.

64-. In a mining machine, a driving motor, cutting mechanism-driven thereby including a pivoted cutter bar and a cutter chain drive sprocket, bar swinging mechanism including 1 transmission gearing driven by said motor, and a plurality of independently operable sliding clutches, one of said clutches beir adapted to connect said transmission gearing to said motor for drive by the latter while the other clutch is adapted to connect said cutterchain drive sprocket to said gearing for drive by said gearing, one of said clutches being disposed coaxial y with the axis of said motor.- 7 V In a mining machine, a driving motor, cutting mechanism driventhereby includin a pivoted cutter bar and'a cutter chaindrive sprocket, bar swinging mechanism including transmission gearing driven by said motor, and a plurality of independently operable sliding clutches, one of said clutches being adapted to connect said transmission gearing to said motor for drive by the latter while the other clutch is adapted to connect said cutter chain drive sprocket to said gearing for drive by said gearing, one of said clutches being disposed coaxially with said spro' 66. In a mining machine, horizontal n, tor having a casing rotatable about an a coincident with the axis of motor rota tion, cutting mechanism carried by said casing,*a frame carried by and rotatable with .carried by said rotatable casing, and means driven by said motor for rotating said casing at different speeds including a plurality of selectively operable speed controlling clutches, and a sliding clutch.

68. In a mining machine, a horizontal driving motor, a casing housing said motor rotatable about the axis thereof, cutting mechanism carried by said rotatable casing, and means driven by said motor for rotating said casing at different speeds including a plurality of selectively operable speed controlling clutches disposed coaxially with the axis of rotation thereof.

69. In a mining machine, a horizontal driving motor, a casing housing said motor rotatable about the axis thereof, cutting mechanism carried by said casing, a frame carried by and rotatable with said casing. and means driven by said motor for rotating said casing at difierent speeds including an arcuate rack and gearing. cooperating therewith, and a plurality of selectively operable speed controlling clutches controlling said gearing, said gearing and clutches being housed within said rotatable casing.

70. In a mining machine, a wheeled truck, a motor thereon having a casing rotatable about the axis of said motor, cutting mech nism carried by said rotatable casing, means driven by said motorfor bodily elevating said casing relative to the truck wheels, and truck driving mechanism operatively connected to said motor.

71. In a mining machine, a wheeled truck, a motor thereon having a casing rotatable about the axis of said motor, cutting mechanism carried by said rotatable casing, means driven by said motor for bodily elevating said casing relative to the truck wheels, truck driving mechanism operatively connectible to said motor, and easing rotating mechanism on said truck operatively connectible to said truck driving mechanism.

72. In a mining machine, a wheeled truck, a motor thereon having a casing rotatable about the axis of said motor, cutting mechan1s m carried by'said rotatable casing, means about the axis of said motor, cutting mechanism carried'by said rotatable casing, means driven by said motor for bodily, elevating said casing relative to the truck wheels, truck driving mechanism operatively connectible to said motor, and means for rotating said casing including mechanism driven by said motor.

74. In a mining machine, supporting means, a motor having a casing rotatably mounted thereon, cutting mechanism carried by said rotatable casing and positioned for cutting in different planes by rotation of said casing, means driven by said motor for rotating said casing, and means for locking said casing in a stationary position relative to said supporting means.

7 In a mining machine, a support, a machine frame rotatably mounted thereon, cutting mechanism supported by said rotatable frame, a motor having its axis horizontally disposed and extending longitudinally of the machine, means driven by said motor for rotating said frame, and means to clamp said frame through friction only against rotation relative to said support.

76. In a mining machine, a support, a machine frame mounted thereon and rotatable relative thereto, cutting mechanism supported by said rotatable frame, a motor, means driven by said motor for rotating said frame, and means to clamp said frame in non-rotative relation relative to said support including a plurality of separate pivoted clamps.

77. In a mining machine, a wheeled support, a driving motor having a casing rotatably mounted about the longitudinal axis thereof on said support, cutting mechanism including, a cutter head rotatable with said casing, a frame secured to and rotatable with said casing, means driven by said motor for rotating said casing, and means including transmission mechanism housed in said rotatable frame and for driving the wheels of said support.

7 8. In a mining machine, cutting mechanism including a pivoted cutter bar, means for swinging said cutter bar about its pivot including a controlling clutch, and separate frictional means cooperating with said bar swinging means for preventing swinging of said bar under the weight thereof when said clutch is released.

79. In a mining machine, cutting mechanism including a pivoted cutter bar, means for swinging said cutter bar about its pivot including a controlling clutch, and separate means including a frictional device for preventing swinging of said bar under the weight thereof when said clutch is released.

80. In a minin machine, a body, cutting mechanism carried thereby, and adjustable supporting means for varying the elevation of said body comprising spaced front and rear arms pivoted between their ends at opposite sides of said body and having wheels at one side of their pivots, adjusting means mounted on said body for effecting swinging movement of said arms including a mechanical connection extending between said arms at one side of said body and movably connected to the arms at the other side of their pivots, and means for actuating said adjusting means to effect simultaneous swinging movement of all of said arms.

81. In a mining machine, a body, cutting mechanism carried thereby, and adjustable supporting means for said body for varying the elevation thereof and comprising spaced front and rear arms pivoted between their ends at opposite sides of said body and having wheels at one side of their pivots and toothed elements at the other side of their pivots, adjusting means mounted on said body for effecting swinging movement of said arms including a mechanical connection extending between said arms at one side of said body and having toothed portions movably connected to said toothed elements, and means for actuating the toothed portions of said adjusting means to effect simultaneous swinging movement of all of said arms.

82. In a mining machine, a body, cutting mechanism carried thereby, and adjustable supporting means for said body for varying the elevation thereof comprising spaced arms pivoted between their ends, said arms having wheels at one side of their pivots and arcuate toothed racks at the other side of their pivots, adjusting means mounted on said body for efiecting swinging movement of said arms including a mechanical connection between said arms and having toothed portions meshing with said arcuate racks, and means for actuating the toothed portions of said adjusting means.

83. In a mining machine, a body carrying a motor, cutting mechanism carried by said body, means for adjustably supporting said body to vary its elevation comprising spaced front and rear parallel arms pivoted between heir ends and having wheels at one side of their pivots, means for effecting swinging movement of said arms while maintaining the latter in substantially parallel relation including adjusting mechanism mounted on said body and movably connected to said arms at the other side of their pivots, means for actuating said adjusting mechanism, and mechanism driven by said motor for driving the wheels of said supporting means irrespective of the elevation of said body relative to the support wheels.

84- In a mining machine, a body, cutting mechanism carried thereby, and adjustable supporting means for said body for varying the elevation thereof and comprising spaced front and rear parallel arms pivoted between their ends and having wheels at one side of their pivots and toothed elements at the other 

